Dental tool holder



l atentecl Sept. 1933 3 UNITED STATES PATENT OFFICE DENTAL TOOL HOLDER William A. Kelsey, Minneapolis, Application October "7, 1931. Serial No. 567,430 7 Claims. (01. 5 1 221) My invention relates to a holder wherein dental and other tools may be securely held during the operation of grinding their cutting edges.

and the primary object of my present invention 5 is to provide a holder for use in sharpening dental chisels of different sizes and shapes of blades to the end that a dentist can keep tools of this description in first-class condition for use. The holder is also adapted for use in sharpening surgical instruments such as hypodermic needles.

A further object is to provide a holder of the type shown and described in Letters Patent of the United States issued to me June 17, 1924, Number 1,498,283, provided with a series of pockets 0r seats adapted to receive the shanks of the tools to be sharpened, means being provided for securely clamping the tools on the seats preparatory-to. the grinding operation.

A further and particular object is to provide a tool holder for gripping dental chisels by the end of the blade near the bevel in a fixed relationship to the line of travel on the sharpening stone and for holding chisels that are 6 millimeters long or longer with blades of Varying widths and shapes.

The invention consists generally of various constructions and combinations all as hereinafter described-and particularly pointed out in the claims. i j

thisv specification,

Figure l is a view partially in section of a tool holder embodying -my invention;

Figure 2 is a plan view of the same;

of Figure 1; v

Figure 4 is a sectional view on the line 44 of Figurel; and,

Figure 5 is a sectionalview on the line 5-5 of Figure 4. I

I11 the drawing, I have provided a suitable frame wherein the operating parts of the holder are mounted. This frame consists preferably of a stone rest or rod'2 that is adapted to rest upon the surface of the stone on which the holder is placed during the grinding operation. A block 3 is provided connected to the stone rest 2 and held in parallel relation therewith by rods 4. A stationary jaw 5 has abeveled undersurface 6 which slides on the surface of the stone, and pins 7 are tapped at one end into the jaw .5 and have collars 8 which are seated against a face of the block 3 and threaded ends 9 which pass through sockets in said block and are provided with nuts 10, by means of which the col- 'way In the accompanying drawing forming part of Figure 3 is a sectional view on the line 3-'-3 the grinding operation and the beveled edge of lars 8 may be drawn against the face of the block and the pins rigidly secured thereto. When this has been done it is evident that the jaw 5 will be held in rigid relation to the block 3.

As shown plainly in Figure 1 the holder is so formed that it will support the chisel to sharpen its bevel at an angle of approximately 42. This bevel I have determined by experiment to be the best for free cutting and maximum strength of the cutting edge.

11 represents a movable jaw having sockets 12 to receive the pins '7 and slide freely'back and forth thereon. This movable jaw has arms 13 adapted to enter recesses 14 provided in the adjacent face of the block 3 and an adjusting screw 15 is tapped into the block and has a ball and socket connection 16 with the jaw 11 midsubstantially between the sockets 12. When, therefore, the adjusting screw 15 is operated the movable jaw will be adjusted back and forth with respect to the fixed jaw. Seats or recesses 1'7 and 17 are provided in the end portions of the fixed jaw extending preferably diagonally therein and lugs 18 are formed on the movable jaw to enter and slide in these recesses. The middle portion of the fixed jaw is provided with seats 19, 20, and 21 of varying size to receive the end of the tool to be sharpened and straight across the jaw and lugs 19 20 and 21 are formed on the movable jaw opposite the seats of the fixed jaw to cooperate with them in gripping the tools. The movable jaw also has slots 22 therein to receive webs 23 which are formed on the fixed jaw and are adapted to slide in the slots 22 to aid in guiding the movable jaw to its seat.

As indicated in the drawing, the stone rest may slide back and forth on, the stone during the chisel will also ride on the stone, holding the stationary jaw out of contact, the blade projecting beyond the jaw as shown plainly in the drawings. If preferred the stone may be moved back and forth with one hand while the holder is held in the other. In doing this the stone is drawn across the beveled edge of the tool until the sharpening operation is completed.

When the jaws are separated, as indicated in- Figure 4, the operator may insert the ends of 105 the dental chisel into the seats of the fixed jaw and when the lugs of the movable jaw are clamped down upon these tools they will be firmly held and there will be no possibility of their slipping out of place during the grinding n operation. Each tool will be inserteda sufficient distance into the seat so that the edge to be ground will project below the beveled face of the fixed jaw, as shown in Figure l, and then when the tool is placed on the surface of the grinding stone, the cutting edges of the tools will be properly positioned to engage the grinding surface and as the device is moved back and forth over the stone, each tool will be accurately and expeditiously ground. As soon as the tools are sharpened the operator may manipulate the screw 15, move the movable jaw to its release position, and the tools may then be withdrawn.

I prefer to provide five sharpening pockets.

or seats for groups of dental tools known as margin trimmers and the various widths of hatchets, hoes and straight shanked chisels, each pocket being of suitable width to receive the blade of the particular chisel that is in tended to be held in that pocket.

The seat 17 is pr ferably a 30-degree angular pocket for varying widths of right mesial and left distal margin trimmers. At the other end of the jaw, the angular pocket 17 is pitched in the reverse direction to receive margin trimmers, the opposite of those held in pocket 17. 19 is a narrower pocket made square with the jaws, adapted to receive dental hatchets, hoes and straight concave and convex blades. 20 is a slightly wider pocket also square with the line of the jaws and 21 illustrates the widest pocket or seat adapted to receive blades from 2 to 3 millimeters in width.

In using the tool the jaws are separated to allow the shank of a dental or other tool to be inserted between them with the cutting edge of the tool projecting the desired distance beyond the fixed jaw to a'point where it may contact with the surface of the grinding stone at the desired grinding angle, the underface of the fixed jaw being out of contact with the surface of the grinding stone as the holder is moved back and forth, or the stone moved across the cutting edge of the tool. As previously indicated, the user may slide the holder back and forth on the stone or grasp the holder in one hand and slide the stone back and forth on the tool edge with the other hand, the shank of the tool during this time being firmly held between the clamping jaws.

A slight turn of the movable jaw operating screw will effect a quick adjustment of the movable jaw to its clamping or releasing position.

It will be understood that the parts of this holder may be varied in size, and in various ways the details of construction herein shown and described may be modified and still be within the scope of my invention.

It will also be understood that while I have shown this tool holder as adapted particularly for use in grinding dental tools it is equally adapted for sharpening other tools, as for instance, surgical instruments and particularly hypodermic needles.

I claim as my invention:

1. A dental tool holder comprising a frame in the form substantially of an inverted V, a fixed jaw forming the lower extremity of one leg of said frame, the opposite leg of said frame having a base portion forming a support to ride upon a sharpening means, said fixed jaw having seats formed therein to receive the shanks of different shaped dental chisels to be sharpened with the tool edge positioned to bear upon the sharpeningmeans between the legs of the frame,

a movable jaw slidably mounted in said frame and having lugs thereon between which and said seats the tools may be clamped, and means for adjusting said movable jaw toward and from said fixed jaw.

2. A dental tool holder comprising a fixed jaw having a beveled face, a movable jaw and frame wherein said movable jaw is mounted for adjustment toward and from said fixed jaw, said jaws and frame forming a holder substantially in the form of an inverted V with the legs of the holder diverging downwardly and the fixed jaw forming the terminal of one leg, said fixed jaw having seats for the shanks of the tools whereby their cutting edges may project into the space between the legs of the frame and the movable jaw having lugs to engage said shanks'and hold them securely on said seats, and an adjusting screw mounted in said frame and engaging said movable jaw.

3. A dental tool holder comprising a block having on one side an inclined supporting leg, rods mounted in said block and divergingdownwardly from said leg, a fixed jaw carried by the lower ends of said rods, a movable jaw having sockets to receive said rods and on which said movable jaw is slidable, said jaws having seats to receive the shanks of the tools between them, and an operating screw mounted in said block and engaging said movable jaw for adjusting it toward and from said fixed jaw.

i. A tool holder comprising a block having an inclined supporting leg, rods mounted in said block and diverging from said leg downwardly, a fixed jaw adjustably mounted on the lower ends of said rods and having a plurality of sockets formed therein of varying widths, a movable jaw slidably mounted on said rods and having lugs depending within said sockets, between which lugs and the bottoms of the sockets the tool blades to. be sharpened may be clamped, and means mounted in said block and engaging said movable jaw for moving it back and forth to clamp or release the tool blades.

5. A tool holder comprising a block and a support therefor on one side forming a frame corresponding substantially to an inverted V, a fixed jaw carried by said block and having a plurality of tool blade sockets or seats formed therein, some of said seats being square with the face of the jaw and others beingin angular relation thereto, a movable jaw mounted to slide toward or from said fixed jaw and havllTO ing lugs thereon to enter said sockets and cothe beveled'end of the blade depending below said jaw when the blade is seated therein and projecting into the gap between the legs of said frame to contact with a sharpening and a movable jaw supported in said frame over said fixed jaw and having means for moving it to a clamping position with respect to said fixed jaw,

the opposite leg of said frame having a lower extremity that is adapted to face of the stone.

7. A tool holder comprising a fixed jaw, a movable jaw and a frame wherein said movable slide on the surjaw is mounted for adjustment toward and from said fixed jaw, said jaw and frame forming a holder substantially in form of an inverted l with the legs of the holder diverging downwardly and the fixed jaw forming the terminal of one leg said fixed jaw having seats for the shanks 

